METHOD OF INTENSIFICATION OF WELL OPERATION AFTER ITS CONSTRUCTION Russian patent published in 2019 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used after completion of the main cycle of well construction with intensification of well operation, formation of cracks and splits in productive formation. Method includes perforation of walls of well in interval of formation of well, lowering of pipe string with packer, installation of packer above roof of perforated productive formation, test pumping of fracturing fluid and pack of fracturing fluid with proppant, correction of fracture design and performance of main process of rupture of final concentration of proppant. At that, in one of the hydraulic fracturing processes the fine proppant fraction is injected with dimension not larger than 30/60 mesh. During construction, formation with oil-saturated thickness of not less than 0.8 m is selected. Perforation is performed by cumulative systems of charges with density of perforation from 10 to 20 holes/m. Preliminary determining the zone of increased hydraulic resistance formed by the muds from the drilling and cement mortar and determining the volume of the proppant, which provides formation of cracks by 30 % longer than the zone of increased hydraulic resistance during test pumping, where fine fraction of proppant with dimension not larger than 30/60 mesh is used. In the main process of hydraulic fracturing there used are fractions of proppant of 30/60 mesh with transition to fraction with dimension of 16/20 mesh and more in volume from 60 to 90 % of total amount of proppant of main process of fracturing with final concentration of proppant of not less than 600 kg/m³.

EFFECT: disclosed method provides formation of cracks during hydraulic fracturing of formation outside the zone of increased hydraulic resistance formed by muds from drilling and cement mortar during construction, due to opening of this zone with margin of 30 % of cracks in test hydraulic fracturing of formation.

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